Report the best way to video switch ? in R/C Electronic Projects Posted May 31, 2007 · Edited June 1, 2007 by Hartwig The signal ground here is always 0V. Sorry, I should have been posting a more dedicated schematic. How about this one? Maybe you need to play around a bit with the values of R1,3,5. But anyway this schematic shows the principle. If you built the circuit according to that schematic, you will have anice biased output at a DC offset level of roughly 2.5V. Also you are able to adjust the video level in a sensible range so you will end up with a signal level of 1Vpp when correctly terminated with 75ohms. If you want to use it as an output buffer stage, just add another 470uF Cap in series to Rout. The 75ohms Resistor on the very right hand side is actually the input of the next device. It works really nice for me. I'm using the LT1207, but you can choose one of your own flavour. Rin (75ohms) is there to terminate the previous stage which feeds its signal into this Buffer/Amp. In order to get multiple outputs from a sngle video source, just use Rin once, and connect the following circuits (all identical to this one) in parallel at this node, so the overall input impedance stays ~75ohms.